Refrigerating apparatus.



, P. W. WOLP,'JR..& H. H. SOUTHWORTH.

REPRIGERATING APPARATUS.

APPLIGATION FILED -MAR` 1, 19111 y i Patent-,ea Dec. 3, 1912.

-. www?, up@ H, H. SOTHWOBTH.

REFRIGERATING APPARATUS.

l APPLIQATIUN FILED MAR. 1, 19'11. 1,046,134.

Patented Dc. 3, 1912.1 l

Aunitari entras Pari-anar FRED W. WOLF, Je., AND HARRISON H. soU'rHwoB'rH, or unicaen, immers, assiett- OBS '.'t ICELESS REFRIGEEATOR COMPANY, 0F CHCAGO, ILLelOt'S, .la

0F ILLINOIS.

BEFRIGEBATING APPARATUS.

waaien.

Specification of Letters Patent.

Patented it,

To all whom it may concern.;

Be it known that We, FRED lV. YVOLF, Jr., and Hannisox il. Soo'rmvonrn, citizens of the United States, and residents of Chicago, in the county of (look and State of'flllinois, have invented certain new and useful Improveniente in Refrigerating Apparatus; and We do hereby deciare that. the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which torni a part of this specification.

rIhis invention relates to an improvement in absorption refrigerating apparatus and consists of the matters hereinafter described and more particularly pointed out in the appended claims.

The invention is shown herein as applied to an absorption system of the alternating type, in which there are included two drums or tanks constituting generatorabsorbers containing ammonia liquor, each of which in alternation contains weak liquor and is subjected to cooling means while it receives and absorbs the amino-nia gas which hasexpanded through the refrigerating coils and at the same time'the other containing strong liquor is heated to drive oft ammonia gas which is then passed tl'irough condensing coils and condensed into liquid form and conveyed to a liquid ammonia receiver from which it passes to the refrigerating coils through'an expansion valve in a familiar manner. In theoperation of such an alternating absorption system it is necessary toalternately cool and' heat the said absorption drums or tanks, vand the object of the present invention is to provide automatic means for controlling the alternate application of heating and of cooling means to the said drums or tanks.

In the drawings Figure 1 is a view representing a vertical section through the absorption drums of a refrigerating apparatus containing the novel features of our invention. Figsf, 3, et and.5 are detail views in front elevation representing the valve for controlling the heating and cooling means and the inen'iliers` which operate it in successive positions. Figs. 6 and 7 are front elevations of the controlling valve on an enlarged s :ale showing the movable valve inein- .her in its ltv'o iositions. Fie. S is a view representing a vertical sectionthrough one ci 'the diaphragm chambers, used in connection with the apparatus. Fig. J is a vertical section through the controiling valve on the line 9-9 of Fig'. l5. Fig. i() a ew showing a rear elevation oit' the controlling valve. Fig. ll isa transverse section through one of the absorption drums on the line tl-ll of Fig. l.

In that embodiment of our invention .illustrated in the drawings, -il indicate two absorption drums located adjacent to each other and adapted to contain ammonia' liquor. Said drums may be of any convenient construction 'for i, in a retrigerating appa ratus.

B B1 indicate jackets surrounding the said drums A and il and adapted for the reception of cooling water. As shown herein, said absorption drums and water jackets have a common bottom member Er".

C C1 indicate dehydrating coils supported, respectively, upon the top of the drums A, A1. The coil C is adapted to receive the an'nnonia gas driven from the drum .-il and is connected therewith by a pipe c and the coil C is adapted to receive the ammonia from the drum A and4 is connecten thereb v pipes C2 C'i with a discharge pipe C leading to the condenser and liquid ammonia receiver (not shown). l* 73 indicate angle check-valves interposed intermediate the pipes C2 (1" and thi.` associated dehydrating coils C Cl. which check-valves are adapted tfr prevent a reverse, ilow of ann'nonia through that one of said dehydrating coils leading to the drum which is absorbing.

The bottom member X ot' ach ot the (.lrun'ls is provided with transverse passages ci a (Fig. 1l) which opens bv a plurality of ports o? into the interior of the drum. Said passages u o are connected b v a threaded nipple with upright pipes D which are connected with a cross-pipe D1, leading from the refrigeating coiisl and adapted to direct the ammonia yas after it has expanded through said retrigerating coiis into one or the other drums A A1. Check-valves (Il are located in each or" the pipes D to prevent the escape of the liquor under pressure iroin the drums to the pipe E, indicate heating coils which are 11,0

. ated :reepeeti'vel 2() ends `of said conneeted respectively with the dr' ins A A1. Said heating coils are incloeed byiconieal hoods el and adapted to li heated by 3\i 'llieiiai^e .,peetively with by pip s tft T. burners are started by pilot lights f f1 supplied. with gas .trom a man] supply pipe -l -G u indicate pipes connectetb---nespectively, with the jacifets li .31 and adapted for the supply of' cooling* water to.said jackets. lilear tbe tops oit the jackets and above the f eroina" coils C @j located .ll which connects pine T i.

j soir diebottom by a through pip said pipe fi `n2irins .it in a be described. ilie Godi-- s ti til, the gas supply iin pipeli, and a lead to a common con h is ojif tl fe lil coin `ned member l@ i The .rotative .tai marmer presently t ing Water supply pip pipes Et E, the main We. pine trollingl oonetruction: tl e members iUv t" and a rotative 4 Y member consists el tegral shai't fr iv'hioii projects lrol'n the rear tace oi said disk. The consists ot' a omtral hub "it having an aper- 'tore in whic Jmit 7:1 has bearingand oi' radial ar priwided with apertures )i12 which open v-t one end through the outer ne and near the other ends and' open by porta 7e3 t said l'1 member turn at an an; "hrongh the iront .la

..2 The eng: ita. Aoittbe valve niembers are pro d with annular packing ringe .71:5 lor/ateov in suital'il" grooves in said faces to make tl joint b uwe n said valve water and gas tight. f :is shown in the draiif'inge, (see Figs. tl, 7 and ld) t e are si: el, which ciiir'eted to the water pipes and t? which are Conlyie mam water i'frjinnre'ed to the, mid

three arms while the sup pipes l (il, leading respectively to lne ecke lil, are each con-- j ted 'to an arm at either side of said middle arm.. In 'it manner the main gas supply pipe it Connected to the middle arm K on the lower side of the valve, while the gas supply pipeel E4 E5, leaifling respectively to the burners E E3, are each coni necled to an arm at either side oi said lower middle arm.

l lll? indicate annular slote forniied in the rear tace oi" the rotativo faire member V2. s: i siete bcir; i lmiggth to vconlnict 1 :allot vil? :forminp;l it

The said.

radial arme iii, three `nular slot K with the water supply pipe (l the supply of gas to the burner E3. When anaemia apparent from this description that when the movable valve member is rotated into the position indicated in Fig. 6 the main Water supply' pipe J will be connected by the anfort'idirecting the coolingv water into the jacket B, Vwhile the main gas supply pipe F will be connected by the annular slot K7 with the gas supply pipe Es so as to direct said movable valve member is rotated into the position indicated in Fig. `7 the main 'water and main gaspipes will be connected, respectively, with the water supply pipe (il tor directing the water into the jacket Bl and with the gas supply pipe E* for directing the supply of gas to the burner E2.

The rotative -valve member K2 is provided with radially'extending diametri'cally opposite cranlearlns L L1 which are automatically operated by the following construction: In. each of the absorption drums A A1 is located a pipe closed at the bottom and pro jeeting through the top of the drum and there connected'.jvith a diaphragm chamber contamina a flexible elastic da hragm which is adapted to be actuated, un er the variations of temperature in saitd drums, by the expansion of a fluid contained insaid pipe and 'which iey arranged to operate a lever operativelyconnected with one of the crankarnis L L1. The construction 1n each case is ,the same so that a description of one will `suliice` for both.

M indicates a pipe located Within the drum A and having its lower end m closed and its. upper end' projecting through the top of the tank and there connected with the interior olf a diaphragm Vcl'larnbei N, (see l'igs. l and N1 indicates a diaphragm forming one Wall oit said diaphragm chamber and fonnected by a rod O With a lever P which is pivotally connected at one end at y? to a yoke P1 supported on the diaphragm chamber. The 1m pipe M contains a fluid' adapted to mpand under the heat developed in the absorption drain and by ite` expanding prcssurelo actnatc the diaphragm and raise the lever l?. To the pipe Dl leading from lthe refrigerating coils is connected a branch pipe Q, which opens into a third diaphragm chamber Q. similar to the others and having a diaphragm member Q2 which is connected by a short rod g to a third lever R pivotally con- 12o nected at. one end to a yoke vsupportefl on said diaphragm chamber.l The chamber itselt' is rigidly connected by a bracket arm r1 with the jacket lil of the drum A1. The three levers P, lJ and li. have their free ends 125 extended into a position above the controlling; faire l( and are each provided with sliding' counter-Weights P21, Px adapted to be .iied .in any position on said levers by means otsoitable set-ecreivs. By means of 13ol rye/raie;

,y a said eounteriveights the pressure required to operate` the respective levers'may be accurately predeten. :ined

their ends with the being looped about vely. .Said pulleys f l F5 to which are fis P7 Which-extend rong apertures or openings .l Z1

L L1. it the ends et' sai linlrs l are secured. Weights i2 la "which are oer than the apertures or openings Z Z1 d act as stops to engage against the arms V1 when, the action oit said levers l?, .it new to .be described., one or the other et' aid ypulley blocks Pt P5 are raised. Startingwith the apparatus at the stage in its cycle of operation in which the valve K is in ythe position indicated. in 7 .when the rfooling.Water is directed into the jacket B1 While the fuel gas is directed into the burnerA E, and when the temperature in the=drum A1 containing weak liquor, by reason 'of the actionot the cooling Water has fallen, While the temperature of the drum A, containing strong liquor, hasiust began to rise by rear ',son o" ther application oi? heat, the diaphragms S1 l( 1' are unaffected/by the uids i y contained in theA pipes M and the diaphragm Q2 isA una'li'ected by .the'pressure of the 'ammonia gas in the pipe D1, since the liquor in the, drum A1 rapidlyv absorbing the arnmonia gas directed to it'irom the refrigerating coils'D1, and thereA is little yor no back pressure in said pipe. The] levers l?, P and `R are then in the positions indicated in Fig. 3. As soon as the temperature of the drum A rises toa point suiicient 'to drive oil the re piired amount of ammonia gas and thus reduce the liquor in the drum to a certain stage or degree ot' Weakness, which temperature is carefully predetermined, the expansion of the duid in the pipe M contained in said tank, expands the associated diaphragm' 'N1 and lifts the associated lever P. This bringsthe levers and iieiiible mem- Abers into the position shown in lig. el with the Weight l connected to the pulley block P5 raised into engaging position with the arm L1 of the valve K. In the meantime "the liquor the drum A1 which has been 'caching the point of the absorbing is a and as it approaches red saturi ing Water to the l n u point, the bach pressure in the pipe D1 l Z2, which was already in engagement with the crank-arm L, rising with said pulley block and rotating with the movable valve member K2 into the position shown inFigs. 5 and 6, with the cooling Water directed into 7p the jacket B about the drum A and the fuel gas directed to the burner E to heatthe drum A1. The pressure against all the dia-v phragms now falls and the levers assume the horizontal position shown in Fig. 3, with the 75, valve however in a reversed position with the crank-arm L1v upand the crank-arm L down and with the position of the pulley blocks and weights reversed to correspond. Ammonia gas is now being driven from the licpuorr in drum A1. and absorbed by the liquor in the drum A. As soon as the predetermined temperature is attained inthe drum A1, the fluid in the associated pipe M expands and actuates the diaphragm to raise g5 the associated lever P. This brings the valve operating part-s linto the position shown in Fig. 2. When the Yback pressure of the ammonia gas in the pipe D1 attains the predetermined pressure, the lever R is raised, lifting the weight 1 which by reason of its engagement with the arm L shifts the movable part of thevalve into the position indicated in Fig. l, and directing the cooljacket B1 and the fuel gas 95 to the burner E2. The operation thus'continues automatically.

When the predetermined temperature in the absorption drum which is being heated is attained before the back pressure in the' 100 drum which is being cooled, has reached the predetermined point at which it will elect the lifting movement of the lever R; which will usually be the case, the continued heating of the said Iirst-named'drum will tend 105 to increase the temperature of said drum above the said predetermined point and thus might cause the liquor in said drum to pass oil' in the form of steam. To obviate this possibility and to maintain the drum which has been heated substantially atthe predetermined temperature /intilthe main controlling valve is shifted, we provide in the case of each drum an auxiliary )'alve in the gas supply pipe between the nain controlling valve andthe burner, which auxiliary valve is directly controlled by the vthermostatic member of its associated drum, said auxiliary valve being operated to at once close oil' the gas supply to the burner of the 120 drum which is being heated when said drum has attained the said predetermined temperature and .being adapted to again open or partially open between the periods when the drum which is being heated reaches the predetermined temperaturgkand when the drum which is being cooled develops `the predetermined back pressure. This is for the purpose of maintainingv the drum which has been heated at the said predetermined 130 the 'the associated lever P.

lever lt israised the .movable valve" member fill be rotated as heretofore described.

ndicates a. valve located in the gas sup- .ply pipe E4 between the main controlling valve lil and the burner E2; 101 is a crank erin adapted for the operation of said valve; a? is a. Weight connected to said crank arm and adapted to maintain said valve u norm 5 ily in. open position,` and is a link pivily connected at onel end to the crank arm .and t itsy other end connected by a pivot pin lll to the lever l) oi' the associated drum A. A, like construction is provided in connection with the other drum, 'D indicating rive. 01, the crank arm which operates it, is. the Weight adapted to normally main- "ainj the valve in open position, and Vy the lint: having; ]'iivotal connection at ol With rlhe opera-tion of these valves is as follows: When `the drum 'which druni il reaches the predetermined te1nperatifire. thc associated-lever P actuated by the thcrniostatic member. Within said drinnv and produces `one part of the two-part liz-ioveinent of the associated Weight Z2 'which acts to rotate the movable member K2 of tained in the drum A1 the valve Will remainl closed7 but should the temperature of said druu'i fall, the lever P controlled by the therniostatic member in said drum will descendi. and this will permit the weight o2 to open or partially open the valve '1J-and the burner E3, vwhich heats said druimwill aga'ih he lighted so to again raise the texnpera ture to 'the predetermined point. This Will eoijitinne, the valve z ai'xtoinat-ically controlling; the llame oi". the burner to maintain the drinn at the predetermined temperature until the movable part lf2 ot the main con-- trolling valve K .is shifted, thus shifting the gas supply to the vother burner and the c0oling water to the druniAl. When the levers l. l), lt, return to their normal horizontal position, thc valve owill open and will then have no tui-.ther effect upon the operation of the system until the drum A1 is again heated and rearhes its nfedeter1nincd temperature.

lil'lliilc in the embodiment. of our invention illustrated .herein ive malte use of ther- .inostatirally actuated means and pressure actuated means for operating the controlling' valves which,anitunatically start and stop the heating and cooling means as applied to each generator absorber', apparently our involition is notV limited to this method or sino; heated as for exam le the' means for applying; the cooling and heating means in alternation to thc tivo generator absorbers. The important feature is that the generator absorber which .is being heated shall 'be heated to a certain. predetermined temperature ,which eorreepords with a certain Weakness of liquor that the apparatus .is designed to 'worli' 'will and that the gencrater absorber lwhich is being cooled shall continu `.to be cooled at least until a certain .pressure has been reached 'therein corre spending with and indicating certain degree ol saturation that the apparatus is absorber which has been absorbing shall begin to heheated andjact as a generator, and thegencrator absorber which has been generating shall begin to be cooled and shall act 'as an absorber.

By the arrngenient thus described an economical. operation of the apparatus is secured since the alternate shitting; of the cooling and heating means `labout outil not 'only the predetermined amount of annnonia gaa has been. driven from the liquor in one drum but also the predetermined quantity of gas has been absorbed by the liquor in the other drinn.. No matter which of these conditions is reached first, the main controlling valve will not be `.shifted to reverse the cycle until both have been. attained although, as just explained, the heating of the drum which is generating will he discontinued as soon the predetermined temperature corresponding to the desired Weakness of liquor therein, has been reached. The main controlling valve actu ating mechanism dependa upon both for its operation. A

ln order to drain the cooling Water from each jaclret of the alim ition druin'when said drumbegins to he Paied. we provide links Xhnd coni'iecting? rcsilicctively, the cfanlt arm lift oi he valve il, adapted to empty the jacket with the crank arm L ot the valve lll and the crank-arm la of with the cranlr in. lil. By this construc tion, when the valve ls shifted to direct the cooling Water from one tank to the other, the assoeiated valve iii or /i of the ln the foregoing description We have redesigned to work with, 'ivhen the generator not brought the aive if?, adapteifi to empty thc jacket B1 jacket surrounrjling the irst-na1ned Ytank is y terr-ed thmugliout to ammonia as the refrigerant to be used in our apparatus with water as the absorl'ient, as types most familiar and common. and such refrigerant and absorbent are preferred, but it will be understood that' the apparatus is capable of use with othe` reirigerants and absorbents and the invention is in no Way limited thereto.

llhile in describing one embodiment of' our. invention ive have illustrated and referred to certain detailsn of mechanical con- .'-.'tiuc1;if.=nl and one form of valve and valve operating mechanism, as Well as to a particular method 'of heating and cooling the drums and to other details of construction and arrangement it is to be understood that uljinvention in no Way limited thereby eX- cept as pointed out in the appended claims.

We claim as our) invention l. ln a retrigerating apparatus of the a1- tcrnating absorption type including generator-absorbers` arranged in pairs, a conduit adapted for leading the expanded ammonia to each generator-absorber of a pair, and means for alternately cooling and heating cach of said generator-absorbers, a controlling member for applying said cooling and heating means to said oenerator-absorbers in alternation, said con rolling member having a two-part movement., thermostaticall actuated means connected with each of said generator-absorbers adapt-ed to produce one part ot said tivo-part movement of said controlling member when the temperature ot the liquor in the generator-absorber subjected to heat rises above a predetermined point. and pressure actuated `means connected with said conduit adapted'to produce the other partwt said two-part moifement of said controlling member when the back pressure in the drum which is being cooled rises above'a predetermined point.

2. ln a refrigerating apparatus of the alternating absorption type including generator-absorbers arranged' inpairs, a conduit adapted for leading the expanded ammonia' 'gas to each generator-absorber cfa pair,

and means for alternately cooling and heating,r cach ot said gencrator-absorbers, a therulcstatically actuated member connected with each gencrator-absorber adapted to be operated when the temperature of the liquor in said generator-ahsorbers rises above a certain point. a pressure actuated member .connected with the said expanded ammonia gas conduit adapted to be operated when the back pressure in one of said generatorabsorliersrises above said point, and a controlling member depending for its operation on the combined action of one of said thermostaticallv actuated members and of said pif ure actuated member adapted for applying said cooling and heating means to said generator-absorbers in alternation.

3. l'n a refrigerating apparatus of the alaasnmnmnm ternating absorption type, including gener- :iter-absorbers arranged in pairs, a conduit adapted ver,for leading the expanded ammonia gas to each generator-absorber of' a pair, means for alternately cooling and heating each of said generator-absorbers, a pipe closed at one end located in each of said generator-absorbers, said pipes containing duid adapted to boil ata predetermined temperature, chambers connected with said pipes and movable members located in each of said chambers, an operating member con-v nected with each ot' said movable members Aadapted to be actuated when Vthe temperature in one of said generator-absorbers has risen to apredetermined point, a third chamber connected with said conduit, a movable member actuated by the pressure in said conduit, a third operating member adapted to be actuated by said movable member ywhen the pressure in said. conduit rises above a predetermined point, and a, controlling member depending for its operation on the combined action of one ot said first two-named operating members and said third-named operating member, said ccntrolling member being adapted for applying said heating and cooling means to said drums in alternation.,

4. In a rerigerating apparatus ot the alternating absorption tvpe, including gener- :ttor-absorbers arranged in pairs` a. conduit adapted for leading the expanded ammonia gas to each generator-absorber of apair, and means for alternatelycooling and heating each of said generator-absorbers, a pipe closed at one end located in each of said generator-absorbers, said pipes containing a fluid adapted to' boil at a predetermined temperature, chambers connected with said pipes and movable members located in each of said chambers, an operating member connected with each of said movable members: adapted to be actuated when the temp rature in one of said generator-absorbers dias risen to ya predetermined point, a third chamber vf connected with s aid conduit,l a movable lmember actuated by the pressure in said conduit, a third operating member adapted to be. actuated by said movable member when the pressure in said conduit rises above a predetermined point, a controlling member or applying said cooling and heating means to said generator-absorbers in alternation, said controlling member having aine-part movement, means having lost motisl connecting one of said firstnamed'operating members and said third named operating member ,with said controlling' member to move it in one direction, and means having lost motion, connecting the other of said first named operating members and said third named operating member to said controlling member to move it in the opposite direction.

-gas to each generator-absorber of a pair,

and means for alternately cooling and. beating each of said generator-absorbers,`a coneach of said generator-absorber trolling memberV for applying said cooling and heating means'to said generator-absorbers m alternation, said controlling member having ay two-part movement, tbermostat- A ically actuated means connected with eacli of said generator-absorbers adapted to produce one part of said two-part movement of said controlling .member when the perature of the' liquor in the generator-al sorbe'r subjected to heat rises above a predetermined point, pressure actuated means connected with said conduit. adapted to produce tbe 'other part of said two-part movement of said controlling member When tbe back pressure in the generator-absorber which is being cooled rises above a prede-- termined point, and auxiliar)1 beat controlling devices one for each generator-absorber, operated by the tbermostatic member of said generator-absorber. 6. In a refrigerating apparatus of tbe alternating absorption type including generator-absorbers arranged in pairs, a conduit adapted for leading the expanded ammonia gas to each generator-absorber of a pair, and means for alternately cooling and beat-- ing each of said generator-absorbers, a thermostatically actuated member connected with each generator-absorberadapted tor be operated when the temperature of the liquor in said generator-absorbers rises above a certain point, a pressure actuated 'member connected with the said expanded ammonia gas conduit adapted to be operated When tbe back pressure in one ot' said generatorabsorbers rises above said point, a controlling member dependin for its operation on the combined action o one of said thermostaticall)7 actuated members and of said pressure actuated member adapted for applying said cooling and beating,r means to said generator-absorbers in alternation, and auxiliary' heat controlling devices-` one for each generator-absorber, operated 'by tbe thrmostatic member of said generator-ab- Sorber.

7.- In a retrigerating apparatus of the alternating absorption type, including ,Lenerator-absorbers arranged' in pairs, a conduit adapted for leading tbe expanded ammonia. gas to each generator-absorber of a pair, means for alternate-l;Y coolingY and beating a pipe closed at one end located in eac-l1 of said generator-absorbers, said pipes containiiig' a fluid adapted to lboil at a prodeteiunined temperature, chambers connected with said pipes and movable niei'nbers located in carb chamber of said chambers, an operai member cou-- nected with eacbL of said r Kblc nien'ilfiere adapted to a 'a tbe lie/unf` ture in one of .raid germutor-rbsorbers .has risen toa prcdetern oint, a tbird connected u. conduit, a movable rneu'iber actuateifl by tbe pressure in said coilduiby a third operati; member adapted to be actuat member when tbe p s riseshabove a prede/termin point, a. con trolling member depemlmpu for its operation on the eon'ibined ai ion of one oi.i said first tufo-nan'u-d operating members and said tl'ird-named operating nwmlmr, said. controlling memliier beingr i '1 'ir applying said beating and cooling means to said generator-alisci-bers in alternation, and. auxiliaryv beat controlling devices, one for each generator-abscrber, actuated by tbe firstnamed operating member oilf' said generatorabsorber.

S. In a r, l

jerating apparatus of the alternating ar ozption type, .incltugling generator-'absorb arrai'iged in pairs, a conduit adapted for leading' the expanded ammonia gas to each generator-al and means "or alternately7 cooling and heating each oi! generator-absorbers, a pipe closed. at one end located in each of said, generator-absorbe said pipes containing a fluid rullap'rvl to 1ooi at a 'gnedotermined temperalure,` chambers connected with ,said pipes and movable men'rbers located in each oi said clnuulie s', an operating member con. nected Willi eaeb ol ,i id movable members adapted to be actuated when 'tbe temperature in one oi L, d generalir-absorbers has risen to a prefflcl'erunned point, a, thirdcl1am-V ber connected with said conduit, a nlovable` member actuated by tbe pressure in said conduit, ay third operating meniilier adapted to be actuated by said movable n'ember when -tlie pressure in sind vconduit aliove Aa predetermined point, a, controlling membem for applying said eenling" and beating means to said generator-absmfloers in alternation.` means having ,lost motion eoin'iecting one of said inst-named operati ng nu-mibers and said member with .sa-idp tbird nan'led operating* controlling; member to 'more it in one direction, means batir lost naotirm. connecting V nurfl ogifuating meurto more it in.

a n d a u Aril iar'; beat bers and sait' ber to said c( the opposite direct; controlling,r devil'es, one nbs/uber.. f infr membe or eacli generator-- dei bv the test named operata to ra sorll e rs.

ln ,.531 u ,nig ao'l'nu'alus of the alternativa? abso pl, :n tvpe rechnung generator-ansorbers ai f i irs, a conduit adapted toi: lean 'to earn general' means for altmimte` nded ammonia pair, and and beating 'orber of: a pair accesses each of saidzgenerator-absorbers, controlling mechanism for applying said cooling and heatingfmeansito said generator-absol-bers inalternation, said controlling mechanism having a two-part movement, means associated with each of said generator-absorbers adapted` to produce one part of said' two-part movement of said controlling mechanism when the vtemperature of the-liquor in the generator-absorber subjected to heat rises above a predetermined point and means associated ivithsaid conduit adapted to produce the other part of said two-part movement of said controlling member when the back pressure in the drum which is beingV cooled rises above a predetermined point,

10. In a refrigerating apparatus of the type described, in combination with generator-absorbers arranged in pairs, means for heating saidgeneratr-absorbers in alternation, means for simultaneously cooling said generator-absorbers in alternation, controlling mechanism for applying said cooling and heating means to said generatorabsorbers in alternation, said controlling mechanism having a; two-part movement, means associated with each of -said generator-absorbers adapted to produce one-part of said two-part movement of Said controllingmechanism when the temperature in the l'generatJr-absorber 'subjected to heat rises above a predetermined point, and means 'associated with each generator-absorber adapted to produce the other part of said two-part movement of said controlling mechanism when the pressure in the drum which is being cooled rises above a predetermined point.

11. In an absorption refrigeration apparatus including a generator-absorber, means for heating said generator absorber and means for cooling said generator-absorber in lalternate cycles, means acting to auto-- matically discontinue the heating of said generator-absorber when the absorbent therein has been reduced to a predetermined stage of weakness` and means acting to automati- 'ca'lly discontinue the cooling of said generator-absorber when the absorbent therein has reached a predetermined degree of saturation.

1Q. In a refrigerating apparatus of the 'type described in combination with generator-absorbers arranged in pairs, means for heating said generator absorbers in alternation, means for simultaneously cooling said generator absorbers in alternation, means for discontinuing the heating of each generator absorber when the temperature therein has reached a predetermined oint, and means fordiscontinuing the coo in of the alternate generator-absorberand or starting the heating. of the same when the pressure therein has reached apredetermined point.

13.- In a refrigerating apparatus ot the type described in combination with genera tor absorbers arranged in pairs, means for' heating said generator absorbers in alternation, means for simultaneously cooling said generatorabsorbers in alternation, means for automatically discontinuing the heating ot'each generator absorber when the temperature therein has reached a prede tei-mined point, and means for automMissiler discontinuing the cooling of the alternate generator-absorber and for' starting the heating of the same when the pressure therein has reached a predetermined point.

14.. In a retrigerating apparat-ns ci the type described, in combination with generator-absorbers arranged in pairs, means for heating said generator-absorbers in alternation, means forsimnltaneously cooling 'said generator-absorbers in alternation, means' for automatically discontinuing the heating" of each generator-absorber when the absor ent therein-has been reduced to a prcdeter mined degree of weakness, and'means for "automaticaliy discontinuing the cooling of the alternate generator-absorber and 'tor starting the period of heating of the same and of the cooling of the other generatorabsorber when the absorbent in thesaid al-' tornate generator-absorber has reacheday predetermined degree et' saturation.

15, In a refrigeratmg apparatusof the type described, in combination with generatorabsorbers arranged in pairs, means 'for' heating said generator-absorbers in alternation, means for simultanecuslvt7 cooling generator-absorbers in alternation, means for automatically discontinuing the heating of each gencrator-absorlmr when the temperature thereinhas reached a predeter; mined point and discontinuing the cooling oi the alternate generator-absorber and for starting the heating thereof `an d generator-absorber when the pressure in said alternate generator-absorber has reached or' passed'a predetermined point. i 16. In a rerrigeratmg apparatus of the type described. in combination with a pair means for automatically the cooling of the other of generator-absorbers. means for heating I termined low point of absorption and' after' the absorbent -in the generator-absorber which has been absorbiner has reached or passed'a predetermined egree of saturation.

17. In Aa refrigerating apparatus ofl the type described, in. combination with alpair of generator-absorbers, means for heating said generator absorbers in alternation, means for simultaneously cooling said-generator-absorbers in alternation, the simultaneous heating of one generatoiwabsorber and Cooling of the other generatorabsorber constituting a cycle, means for automatically discontinuing the heating of each gen-l erator-absorber ,when a predetermined teniperature therein has been reached, and means for automatically reversing the cycles 'of operation of said generator-absorbers after the said predetermined temperature has been reached in the generator-absorber which has been generating and after a predetermined pressure has been reached or passed in the generator-absorber which is absorbing.

18. In a refrigerating apparatus of the type described, in combination with a pair of generator-absorbers, means for heating said generatorabsorbers in alternation,

- means for simultaneously cooling said genwhich has been generating has reached the said predetermined temperature and to produce the balance of said. movement when the generatonabsorber which. 'has been. absorbing has :reached or passed a predetcn mined degree of saturation. i

19.,In a refrigerating apparatus of the type described, the combination with gencrater-absorbers arranged inv pairs, means `for heating said generator-absorbers in alternation, and means for simultaneously cooling said generator-absorbers in alterna-- tlon, of means for reversing the supply or'r heating'agent, said means beingr conditioned for its operation upon the conjoint con'ditions of desaturation in the gencraterab` sor-ber which is being heated and oil .autumn tion in the gencratonabsorber which 'be ing cooled.

20. In a refrigerating Aapparatus nt the type described, the combination with gelmintor-absorbers'arranged in pairs, means for heating said generator-absorbersin alterna tion, and means for simultaneously ccmling` said generator-absorbers in alternation, ot means for reversing the supply of the cooling agent, said means being conditioned 'for its operation upon the conjoint conditions oi desaturation in the generator-absorber wh ich is being heated and of saturation in the gon erator-absorber Wh ich is heilig cooled.

, 2l. In a refrigerating apparatus of the type described, the combination with generator-absorbers arrangedy in pairshmeans for heating said generator-absorbe!'s in 'alu-ruation, and means tor snnultam-:ously `cooling sald generatoiabsorbers in alternation, ot

,means for reversing the supply oif the lieating agent and ofthe cooling agent, said, means being dependent for its operation 'upon the conjoint conditionoil desaturation in the gener-atenabsorbercwhichr being heated an/d of saturation in the generator absorber Which is being cooled.

In testi1nony, tl1at, We claim the .foregoing as our invention vWe affix our sig'nnures in the presence of two Witnesses, this 8th day of February A. D. 1911. i

. FRED 1V. WTOLF, Ju. HARRISON H. SOUTHWOlt'lll,

Witnesses:

T. H. ALrREDs, GEORGE R. VVILKINa 

